840394 has 8 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 417036.

The previous prime is 840353. The next prime is 840439. The reversal of 840394 is 493048.

840394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234 + ... + 1789.

It is an arithmetic number, because the mean of its divisors is an integer number (158760).

2⁸⁴⁰³⁹⁴ is an apocalyptic number.

840394 is a deficient number, since it is larger than the sum of its proper divisors (429686).

840394 is a wasteful number, since it uses less digits than its factorization.

840394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 840394 is about 916.7300584141. The cubic root of 840394 is about 94.3686294546.

The spelling of 840394 in words is "eight hundred forty thousand, three hundred ninety-four".